package 反射;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

//动态的创建对象，通过反射
public class Test07 {
    public static void main(String[] args) throws ClassNotFoundException, IllegalAccessException, InstantiationException, NoSuchMethodException, InvocationTargetException, NoSuchFieldException {
        //获得Class对象
        Class c1 = Class.forName("反射.User");
        //构造一个对象
        //User user = (User)c1.newInstance();+
        //System.out.println(user)  ;

        //通过构造器创建对象
        Constructor Constructor = c1.getDeclaredConstructor(int.class, String.class);
        User user2= (User) Constructor.newInstance(1, "樊军刚");
        System.out.println(user2);
        //通过反射调用普通方法
        User user3 = (User) c1.newInstance();
        //通过反射获取一个方法
        Method setName = c1.getDeclaredMethod("setName", String.class);
        setName.invoke(user3,"樊军刚");
        System.out.println(user3.getName());
        //通过反射操作属性
        System.out.println("------------------------------------------------------------");
        User user = (User) c1.newInstance();
        Field name = c1.getDeclaredField("name");

        //不能直接操作私有属性，我们需要关闭程序的安全监测，属性或方法的setAccessible(true)
        name.setAccessible(true);
        name.set(user,"fjg");
        System.out.println(user.getName());

    }
}
